Veteran rock band "Fall Out Boy" joked they are the black sheep of the lineup.

"For us it's really interesting because we get to play with acts and bands that we otherwise wouldn't get to play with. So that's fun and it changes things. And we're walking down the hall and we're like, oh, they're dancers here and stuff. Why don't we have dancers. I've thought that for years now, multiple times," said bassist Pete Wentz.

Jazz singer Harry Connick Jr. and his wife surprised their teenage girls with tickets to the show.

"Kate specifically, my daughter, 16-year-old daughter, has been asking about Jingle Ball for a long time. So Jill (wife) and I worked on getting the tickets and surprised them as an early Christmas present. So this worked out really well," said Connick, who is in the middle of judging the new season of the U.S. singing competition show American Idol.

Some of the proceeds from the night's concert will go to benefit TV personality and Idol host, Ryan Seacrest's charity.

"We're building studios, TV and radio studios around the country in children's hospitals and tonight helps that out," he said on the red carpet.